1. Requirements Engineering
Software Engineering
Requirements Engineering

2. Phases in Software Development
Software Engineering
Phases in Software Development
When ever we develop a program or build something, there are some activates we perform.
Example:
Requirement Analysis
Design
Coding
Testing
Same activates are performed in software development

3. For large where the problem solving activates may last for many years and where many people are involved in development, performing theses activates without proper documentation will not work.
In most commercial software developments there are some activates performed before the analysis requirement takes place called feasibility analysis phase in order to calculate cost and profit.

4. Software Engineering
Requirement Analysis
Requirement analysis is done in order to understand the problem which the software system is to solve.
The problem could be automating an existing manual system or developing a new system
For large system where there are a lot of features, understanding the requirement is a major problem.

5. Software Engineering Two parties are involved in this process
In this phase the emphasis is given on identifying what is needed from the system and not how the system will achieve the goals
Two parties are involved in this process
A client ………… A developer

6. Software Engineering There are two major activities in this phase
Problem understanding or analysis and requirement specification (software Requirement specification
This phase ends with the validation of the requirements specified in the document.

7. Software Engineering Software Design
The purpose of the design phase is to plan a solution of the problem specified by the requirement document.
Design stage takes us towards how to satisfy the needs.
Most important part of the software
Blue print of the software

8. Software Engineering
The design activity is often divided into two parts
System design
Detailed design
This phase produces a design document
Partitioning and Abstraction
Validation

9. Software Engineering Coding
The goal of this phase is to translate the design into a code in a given Language
The coding phase affects both the testing and maintenance phase.
Single entry------Single exit construct

10. Software Engineering Testing
Testing is the major control measure employed during software development
Its basic purpose is to detect errors in the software.
Unit testing
Integration testing
Acceptance Testing
Regression testing

11. Software Engineering
For testing to be successful, proper selection of test cases are essential.
Black box testing
Structural Testing
Test Plan It identifies all the testing activates that must be performed and specifies the schedule, cost, resources, different units to be tested and the manner in which all the modules will be integrated, different test cases etc.

12. Software Engineering Maintenance
It is not a part of software development but extremely important activity in software product.
It always start after the software is delivered to the customer
Two major forms of maintenance are

13. Software Engineering
Adaptive maintenance
Corrective maintenance